County Highway #23 over Oak Ck
FairMellette County, South Dakota · 3S Mosher · Structure no. 000000048480298
- Built
- 1957
- 68 years old
- Condition
- Fair
- inspected September 2024
- Type
- Slab
- Concrete Continuous
- Length
- 129 ft
- 5 main spans
- Daily traffic
- 63
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
County Highway #23 over Oak Ck is a concrete continuous slab carrying County Highway #23 over Oak Ck in Mellette County, South Dakota. It was built in 1957, so it is 68 years old, older than the South Dakota average of 48.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 63 vehicles a day, roughly 3% of them trucks, projected to reach 63 by 2032. The structure is 129 ft (39.2 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was County Highway #23 over Oak Ck built?
It was built in 1957, making it 68 years old in 2025.
What condition is County Highway #23 over Oak Ck in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.
How much traffic does County Highway #23 over Oak Ck carry?
About 63 vehicles per day (2022 count), of which roughly 3% are trucks.
How long is County Highway #23 over Oak Ck?
The structure is 129 ft (39.2 m) long with a longest span of 28 ft (8.4 m) and a deck 28 ft wide.
Who owns County Highway #23 over Oak Ck?
It is owned by the County Highway Agency.